SatLink VSAT User Guide
Publication no. 101557
Copyright © 2009 – STM Group, Inc.
Page 96 (160)
Figure 1: Connection of Transmit Inhibit
Switch to SatLink 100
When transmit inhibit mode is set or cleared, an event is logged. The error LED of the SatLink
1910 will be lit when the transmit inhibit mode is activated. .
19.2 GPS Interface
The SatLink 1910 with the MOBILE license key set can automatically read its GPS position
from an external GPS via the NMEA-0183 protocol and hence constantly have available correct
GPS position for use to calculate correct delay to the satellite to anble the logon burst to be sent
with correct timing when the mobile VSAT wants to enter a SatLink network.
Two NMEA-0183 GPS strings, GPGLL and GPGGA, are supported by the SatLink mobile
VSATs.
The GPGLL GPS string concerns the geographic position. STM supports the following string:
$GPGLL,4916.45,N,12311.12,W,225444,A,*31
This string indicates a latitude of 49 degrees, 16.45 minutes North and a longitude of 123
degrees, 11.12 minutes West, with a fix taken at 22:54:44 UTC. Data status is set to A, or active
(can be set to V, or void). Checksum data is indicated by the 31 at the end of the string.
CJ1 RJ11
SatLink 100
Plug
-
in Card
Tx inhibit switch
connects to the
two center pins
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